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WASHINGTON, DC - DECEMBER 07: U.S. Defense Secretary-nominee, retired Marine Gen. James Mattis, is seen during a meeting with Senate Majority Leader Sen. Mitch McConnell (R-KY) December 7, 2016 at the Capitol in Washington, DC. Mattis, who had retired from the military in 2013, will need a waiver from Congress because current federal law bars military personnel who have retired less than seven years from taking the position. (Photo by Alex Wong/Getty Images)